SHJ,
The online AppleStore usually has clearance stock, although these are normally no more than one version old. Typically, they are end-of-line, or fully warranted Macs which have been returned to Apple (all customers can take back their new Macs within two weeks of purchase for a full refund, for example). They go for around 10% discount on the price of a new machine. Currently, the UK AppleStore only has 13" MacBooks on clearance.
Applemacster.